devilry_subjectadmin...detailedperiodoverview: Do not lock the name-column.

Seems to cause some issues, and I do not have the time to debug it right now.
devilry_subjectadmin: Usable CSV periodoverview exporter.
devilry_subjectadmin...exportdetailedperiodoverview.py: Use the csv module.
devilry_subjectadmin.test.exportdetailedperiodoverview: Rename to the same as the view module.
devilry_subjectadmin.test.exportdetailedperiodoverview: Test CSV output.
devilry_subjectadmin.test.exportdetailedperiodoverview: Remove print.
devilry_subjectadmin.exportdetailedperiodoverview: Working xlsx exporter.
devilry_subjectadmin.exportdetailedperiodoverview: One col for each detail.
devilry_subjectadmin...AdminsBox: Spelling error.